Why are some physical theories replaced by others?

The process of knowing the world, including on the basis of the existing physical theory, leads to the discovery of new facts, new phenomena that cannot be explained by the existing theory. To explain new facts, new hypotheses are put forward and a new physical theory is developed.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.